Ultra Trail of the Sources

The Ultra-Trail des Sources (UTDS) is a multi-distance trail running event set in the Ardennes region of Wallonia, Belgium. The event weekend features very long trail options including a 160 km race alongside 80 km and 42 km distances, with both solo and relay formats mentioned for the longer distances. Courses traverse rugged woodland and rural terrain around Spaloumont, Spa, Theux, Stoumont and Trois-Ponts and include substantial elevation gains, making the races a stern but scenic test for experienced trail runners. The 80 km option is listed with a 07:00 start on 8 August 2026 on organiser-facing pages, and the 160 km option is identified on aggregator listings as the flagship ultra distance.

UTDS is organised under the Ultra Trail des Sources brand and the official race pages and registration links are hosted at the event website. Relay formats for 160 km and 80 km are offered alongside solo entries, and the longer distance is referenced as part of UTMB® Index listings on secondary pages. Practical details such as exact timetables, race services and entry inclusions are not shown on the scraped pages and should be confirmed on the official site when it is available. Participants are advised to consult the organiser’s site and social channels for the most current information on routes, kit rules and logistics.